<template>
  <div class="shopcar-container">

    <div class="goods-list">

      <!-- 商品列表项区域 -->
      <div class="mui-card" v-for="(item, i) in goodslist" :key="item.id">
        <div class="mui-card-content">
          <div class="mui-card-content-inner">
            <el-checkbox-group v-model="checkedGoods" @change="handleCheckedGoodsChange">
              <el-checkbox v-model="$store.getters.getGoodsSelected[item.id]" :key="item.id" :label="item.id" size="medium"
                           @change="selectedChanged">

              </el-checkbox>
            </el-checkbox-group>
            <img :src="item.thumb_path">
            <div class="info">
              <h1>{{ item.title }}</h1>
              <p>
                <span class="price">￥{{ item.sell_price }}</span>
                <numbox :goodsid="item.id"></numbox>
                <!-- 问题：如何从购物车中获取商品的数量呢 -->
                <!-- 1. 我们可以先创建一个 空对象，然后循环购物车中所有商品的数据， 把当前循环这条商品的 Id， 作为 对象 的 属性名，count值作为 对象的 属性值，这样，当把所有的商品循环一遍，就会得到一个对象： { 88: 2, 89: 1, 90: 4 } -->
                <a href="#" @click.prevent="remove(item.id, i)">删除</a>
              </p>
            </div>

          </div>
        </div>
      </div>

    </div>

    <!-- 结算区域 -->
    <div class="clearfix box-bill">
      <el-checkbox size="medium" :indeterminate="isIndeterminate" v-model="checkAll" @change="handleCheckAllChange">全选
      </el-checkbox>
      <div>
        <span>合计：</span>
        <span class="money-red">￥{{ $store.getters.getGoodsCountAndAmount.amount }}</span>
        <el-button type="warning">结算({{ $store.getters.getGoodsCountAndAmount.count }})</el-button>
      </div>
    </div>

    <p>{{ $store.getters.getGoodsSelected }}</p>

  </div>
</template>

<script>
    import numbox from '../subComponents/shopcar_numbox.vue';

    export default {
        data() {
            return {
                isIndeterminate: true,
                checkAll: false,
                idOptions: [],
                 checkedGoods: [],
                goodslist: [], // 购物车中所有商品的数据
            };
        },
        created() {
            this.getGoodsList();
        },
        mounted(){
        },
        methods: {
            handleCheckAllChange(val) {
                this.checkedGoods = val ? this.idOptions : [];
                this.isIndeterminate = false;
            },
            handleCheckedGoodsChange(value) {
                let checkedCount = value.length;
                this.checkAll = checkedCount === this.idOptions.length;
                this.isIndeterminate = checkedCount > 0 && checkedCount < this.idOptions.length;

            },
            getGoodsList() {
                // 1. 获取到 store 中所有的商品的Id，然后拼接出一个 用逗号分隔的 字符串
                this.$store.state.car.forEach(item => {
                    this.idOptions.push(parseInt(item.id))
                    if (item.selected){
                        this.checkedGoods.push(parseInt(item.id))
                    }
                });
                // 如果 购物车中没有商品，则直接返回，不需要请求数据接口，否则会报错
                if (this.idOptions.length <= 0) {
                    return;
                }
                // 获取购物车商品列表
                this.$http
                    .get('api/goods/getshopcarlist/' + this.idOptions.join(','))
                    .then(result => {
                        if (result.body.status === 0) {
                            this.goodslist = result.body.message;
                        }
                    });
            },
            remove(id, index) {
                // 点击删除，把商品从 store 中根据 传递的 Id 删除，同时，把 当前组件中的 goodslist 中，对应要删除的那个商品，使用 index 来删除
                this.goodslist.splice(index, 1);
                this.$store.commit('removeFormCar', id);
            },
            selectedChanged() {
                // 每当点击开关，把最新的 快关状态，同步到 store 中
                // console.log(id + " --- " + val);
            },
        },
        watch:{
            checkedGoods: function() {
                this.$store.commit('updateGoodsSelected',this.checkedGoods)
            }
        },
        components: {
            numbox,
        },
    };
</script>

<style lang="scss" scoped>
  .shopcar-container {
    background-color: #eee;
    overflow: hidden;
    span.el-checkbox__label{
      display: none!important;
      visibility: hidden;
    }
    .goods-list {
      .mui-card-content-inner {
        display: flex;
        align-items: center;
      }
      img {
        width: 60px;
      }
      h1 {
        font-size: 13px;
      }
      .info {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        .price {
          color: red;
          font-weight: bold;
        }
      }
    }
    .jiesuan {
      display: flex;
      justify-content: space-between;
      align-items: center;
      .money-red {
        color: red;
        font-weight: bold;
        font-size: 16px;
      }
    }
    .box-bill {
      position: fixed;
      width: 100%;
      bottom: 50px;
      z-index: 999;
      line-height: 50px;
      background-color: white;
      padding: 0 5px;
      border-top: 1px solid #ccc;
      border-bottom: 1px solid #ccc;
      .el-checkbox{
        margin-right: 0;
      }
      .money-red {
        color: red;
      }
      div {
        float: right;
        button {
          height: 100%;
          vertical-align: middle;
        }
      }
    }
  }
</style>
